Rotary-valve distributing device for compressed-air and like engines



A ia; a 192a, mmzw N. FRANgms ROTARY VALVE DISTRIBUTING DEVICE FORCOMPRESSED AIR'AND LIKE ENGINES Filed Feb. 1, 1924 Patented Apr. 6,l926,

TE S

NICOLAS raanoors, or nanssoox, NEAR LIEGE, BELGIUM.

ROTARY-VALVE DISTRIBUTING DEVICE FOR COMPRESSED-AIR AND LIKE ENGINES.

Application filed. February 1, 1924.

To all whom it may concern:

Be it known that I, Nroones FRANQOIS, a subject of the King of theBelgians, residing at llressoux, near Liege, Belgium, have invented newand useful Improvements in R0- tary vali 'e Distributing Devices forCornpressed-Air and like Engines, of which the following is aspecification.

The present invention relates to an improved rotary valve distributingdevice for compressed air and like engines with single ormultiplecylinders, and more particularly to a rotary valve distributing device.ot the cylindrical type, provided with circumferential ports andrecesses or channels controlling the admission, the expansion and theexhaust ot the air or other driving fluid, asingle device of this kindbeing sutiicient for any number of cylinders.

The essential feature of the rotary valve distributing device accordingto the invention resides in the particular construction and arrangementof its parts, whereby the rotation in one direction, the stopping, andthe rotation in the other direction of a compresed air engine may beobtained by impartan angular movement to one of the concentric cylindersconstituting the device, the particular arrangement 0*? the ports makingpossible to obtain on sta ing the engine a longer period or": admissionthan during normal running, with a view to avoiding dead centers.

In order that the invention may be readily understood, one en'ibodilnentor same. is, by =way or" exampleonly illustrated by the accompanyingdrawings, wherein:

Fig. 1 is a longitudinal section of a rotary valve distributing deviceaccording to the invention, which is in the present case placed abovethe cylinders and coaxial therewith.

Fig. 2, Fig. 3, Fig. i, Fig. 5 and Fig. 6 are transverse sectionsthrough the same device showing the parts in the positions which theyoccupy respectively when the engine is stopped, during the admissionperiod on the engine being started, during the admission period when theengine runs normally, during the expansion period and during the exhaustperiod.

Referring to the said drawings, the device comprises three concentriccylinders, of which the first a is driven by the engine and rotates inthe present instance at the same speed as that of the latter, while thesecond Serial No. 689,973.

Z) is stationary and the third 0 is capable of having a predeterminedangular movement or fractional rotation imparted thereto by means'ot asuitable operating lever (Z integral therewith or suitably fixedthereon.

The three cylinders a, b, 0 are mounted in a casing e which may or maynot be cast integral with the cylinders 1 2, 3, l of the engine, and isprovided with ports f COHlHlLlDIlCZttlDg with the said cylinders andwith ports g communicating with the ex-, haust pipe 7L.

The inner cylinder at is hollow and closed at both ends; a set of portsi, which are also provided in the cylinders b and 0 permits theadmission of compressed air or other driving fluid via the inlet 72provided in the casing e and by way otthe circular groove Z cut in thesaid casing.

The said cylinder (4 is also provided with ports m for the admission ofthe air at the required moment in each cylinder of the engine via theports a, a or 0, 0 ot' the intermediate cylinder Z), according to whichone or ones of these ports register with the corresponding port 29 or p.of the outer cylinder 0, and by way of the circular grooves Q and portsf of the casing e.

The inner cylinder (6 also has longitudinal recesses or grooves rcommunicating with circular grooves or channels 8 which in turncommunicate with the exhaust pipe it via ports tin the cylinders b andc, circular grooves a cut .in the casing e, and the ports g. x

These recesses r serve to obtain the exhaust at the required momentthrough the. same ports a, n or 0, 0" and in a manner similar to theadmission. The ports a, n and 0 0" form two sets of ports correspondingto the two dilterent directions of rotation of the engine; the ports aand 0 are made to serve when the engine runs normally and the ports aand 0 respectively serve for obtaining a longer period of ad mission, i.e. for forcing the admission, on starting the engine.

Thus, if the outer cylinder 0, which is as stated capable of angularadjustment by means of the lever (Z, is moved in the direction of thearrow as when the inner cylinder a is rotating in the direction of thearrow 2 (see Fig. 8), at a given moment the port a and a portion of theport a will be uncovered by the port 2) and while the passage for theadmission is reduced the latter will have a duration proportional to theangle 5.

If the said movement of the outer cylinder c is continued until the portp exactly registers with the port n, the additional port n at the sametime becoming obturated (see Fig. 4), the period of adnii ion will beproportional to the angle a smaller than the angle [3 by the quantity yand corresponding to the norn'ia-l running of the engine. It is obviousthat the size ol' the additional port a or 0 determines the ar g'le ofadmission proportional to the increased period oi admission on startingthe engine.

l' 's hen in practice and for mechanical reasons the distributing devicewill hate to rotate at half or a third of the speed of the engine, thesaid device would be provided with two or three series of the abovedescribed distribution ports.

I claim:

1. In a rotary valve distributii device for compressed air and like cngthe combination of: a casing having connnunications with the enginecylinders and the exhaust pipe an inner rotary distributing cyl inderdriven by the engine and having admission ports and exhaust channelsformed therein; -a stationary intermediate cylinder arrangedconcentrically to said inner cylinder and having ports corresponding toeach direction of rotation of the engine formed therein; and an outercylinder having communication ports tt'orn'ied therein, mounted withinthe aforesaid casing concentrically to the two first-named cylinders andcapable o1" angular adjustment in rela tion thereto whereby saidcoinnninication ports may be brought to register with such of the portsof the interniediate cylinder as will correspond to the rotation of theen gine in Whatever direction is desired; snl stantially as described.

2. In a rotary Valve distributing device for compressed air and likeengines, the combination of: a casing having communications with theengine cylinders and the exhaust pipe; an inner rotary distributingcylinder driven by the engine and having admission ports and exhaustchannels formed therein; a stationary intermediate cylinder arrangedconcentrically to said inner cylinder and having )llllS of sets of portsof which each set of a pair cor sponds to one direction, ol rotation ofthe engine; and an outer cylinder baring comniunication ports i'ormcdtherein mounted within the aforesaid casing concentrically to the twofirstnained cylinders and capable of angular adjustment in relationthereto whereby Silltl. comnrunication ports may be brought to registerwith such sets or" the pairs of sets of ports in the intermediatecylinder as will correspond to the rotation of the engine in 'whatererdirection is desired; substantially' as described.

:3. In a rotary valve dist outing dcricc for compressed air and likeengines, the combination of: a casing have coniniunications with theengine cylinders and the exhaust pipe: an inner rotary distriluitinglitltl driven by the engine and hat; g ports and exhaust channels sionformed therein; a' stationary intermediate arranged concczitrically tosaid in nor cylinder and having pairs of sets of ports ot Which each setof a pair corresponds to one direction of rotation of the engine andcomprises a port tor normal running and an i tional port for obtaining aaddi forced adnns, c i on starting the engine; and an outer cylinderhaving con'nnunication ports rorm d therein, mounted within usingcoicentri ally to the the aforesaid tuo first-named cylinders andcapable of angular adjustment in relation thereto whereby saidcommunication ports may be brought to register with either the port tornormal running alone or the additional port as Well of the sets of po 5;ol the intermediate cylinder corresponding to the desired direction ofrotation of the engine; substantially as do? ribed.

In testimony \rhe'eot I signed hereunto my name.

NICOLAS FRANQOIS.

